Airworthiness Directive · Amendment 39-15322 · Pratt & Whitney (PW) PW4164, PW4168, and PW4168A Turbofan Engines
Pratt & Whitney (PW) PW4164, PW4168, and PW4168A Turbofan Engines
This AD applies to Pratt & Whitney PW4164, PW4168, and PW4168A turbofan engines with certain low pressure turbine (LPT) stage 4 disks, part number (P/N) 51N404, that have a serial number (S/N) listed in the following Table 1, installed. These engines are installed on, but not limited to, Airbus A330-200 and A330-300 series airplanes.
| LPT Stage 4 Disk Serial Nos. |
| CLDLC01142 |
| CLDLC01143 |
| CLDLC01144 |
| CLDLC01145 |
| CLDLC01146 |
| CLDLC01148 |
| CLDLC01149 |
| CLDLC01150 |
| CLDLC01151 |
| CLDLC01152 |
| CLDLC01181 |
| CLDLC01182 |
| CLDLC01183 |
| CLDLC01185 |
| CLDLC01186 |
| CLDLC01187 |
The FAA is adopting a new airworthiness directive (AD) for PW PW4164, PW4168, and PW4168A turbofan engines with certain low pressure turbine (LPT) stage 4 disks, part number (P/N) 51N404, installed. This AD requires removing certain LPT stage 4 disks, listed by serial number at the next piece-part exposure or within 7,500 cycles-since-new (CSN). This AD results from a report of improperly manufactured LPT stage 4 disks. We are issuing this AD to prevent an uncontained engine failure due to low-cycle fatigue (LCF), which could result in damage to the airplane.
You are responsible for having the actions required by this AD performed at the next piece-part exposure after the effective date of this AD or within 7,500 cycles-since-new, unless the actions have already been done.
Remove from service any LPT stage 4 disk that has an S/N listed in Table 1 of this AD.
After the effective date of this AD, do not install any disk, P/N 51N404, that has an S/N listed in Table 1 of this AD or any disk removed as specified in paragraph (f) of this AD except as allowed by paragraph (h) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
